... for attaching into metal, aluminium, or stainless steel. Self-drilling fasteners for attaching into metal, aluminium, or stainless steel. ... bonded neoprene washers to order.Specifications: Head: Hex head, Hex flange head, Pan head, Pan framing head, Flat head, Truss head, Wafer head, Oval headRecess: Phillips, Pozi, Slotted ... tempering) Zinc plated 3 - 5 my or 5 - 8 my self drilling screw